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    </script></div> <ul class="sidebar-links"><li><a href="/sass-cn/install/" class="sidebar-link">安装</a></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>学习指南</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/sass-cn/learn/" class="sidebar-link">基础知识</a></li><li><a href="/sass-cn/learn/Preprocessing.html" class="sidebar-link">预处理</a></li><li><a href="/sass-cn/learn/Variables.html" class="sidebar-link">变量</a></li><li><a href="/sass-cn/learn/Nesting.html" class="sidebar-link">嵌套规则</a></li><li><a href="/sass-cn/learn/Partials.html" class="sidebar-link">片段文件</a></li><li><a href="/sass-cn/learn/Import.html" class="sidebar-link">文件导入</a></li><li><a href="/sass-cn/learn/Mixins.html" class="sidebar-link">混合器</a></li><li><a href="/sass-cn/learn/Extend.html" class="sidebar-link">扩展与继承</a></li><li><a href="/sass-cn/learn/Operators.html" class="sidebar-link">操作符</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>文档</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/sass-cn/api/" class="sidebar-link">综述</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading open"><span>样式规则</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/sass-cn/api/StyleRules/" class="sidebar-link">综述</a></li><li><a href="/sass-cn/api/StyleRules/PropertyDeclarations.html" class="active sidebar-link">属性声明</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/sass-cn/api/StyleRules/PropertyDeclarations.html#插值" class="sidebar-link">插值</a></li><li class="sidebar-sub-header"><a href="/sass-cn/api/StyleRules/PropertyDeclarations.html#嵌套" class="sidebar-link">嵌套</a></li><li class="sidebar-sub-header"><a href="/sass-cn/api/StyleRules/PropertyDeclarations.html#隐式声明" class="sidebar-link">隐式声明</a></li><li class="sidebar-sub-header"><a href="/sass-cn/api/StyleRules/PropertyDeclarations.html#自定义属性" class="sidebar-link">自定义属性</a></li></ul></li><li><a href="/sass-cn/api/StyleRules/ParentSelector.html" class="sidebar-link">父节点选择器</a></li><li><a href="/sass-cn/api/StyleRules/PlaceholderSelectors.html" class="sidebar-link">占位符选择器</a></li></ul></section></li><li><a href="/sass-cn/api/Variables.html" class="sidebar-link">变量</a></li><li><a href="/sass-cn/api/Interpolation.html" class="sidebar-link">插值</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>@规则</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>值类型</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>操作符</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>内置模块</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>重大改变</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>命令行</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/sass-cn/api/JsApi.html" class="sidebar-link">JavaScript API</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="属性声明"><a href="#属性声明" aria-hidden="true" class="header-anchor">#</a> 属性声明</h1> <div><script async="async" src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins data-ad-client="ca-pub-6227283216337087" data-ad-slot="9720145993" class="adsbygoogle" style="display:inline-block;width:600px;height:90px"></ins> <script>
    (adsbygoogle = window.adsbygoogle || []).push({});
    </script></div> <p>与CSS一样，在Sass中，属性声明定义了匹配选择器的元素的样式。但Sass增加了额外的功能，使它们更容易编写和自动化。首先，声明的值可以是任何<a href="/sass-cn/api/Syntax/Structure.html#表达式">SassScript表达式</a>，它将被计算并包含在结果中。</p> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token selector">.circle </span><span class="token punctuation">{</span>
  <span class="token property"><span class="token variable">$size</span></span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
  <span class="token property">width</span><span class="token punctuation">:</span> <span class="token variable">$size</span><span class="token punctuation">;</span>
  <span class="token property">height</span><span class="token punctuation">:</span> <span class="token variable">$size</span><span class="token punctuation">;</span>
  <span class="token property">border-radius</span><span class="token punctuation">:</span> <span class="token variable">$size</span> <span class="token operator">/</span> 2<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token selector">.circle</span>
<span class="token variable-line">  <span class="token variable">$size</span><span class="token punctuation">:</span> 100px</span>
<span class="token property-line">  <span class="token property">width</span><span class="token punctuation">:</span> <span class="token variable">$size</span></span>
<span class="token property-line">  <span class="token property">height</span><span class="token punctuation">:</span> <span class="token variable">$size</span></span>
<span class="token property-line">  <span class="token property">border-radius</span><span class="token punctuation">:</span> <span class="token variable">$size</span> <span class="token operator">/</span> 2</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">.circle</span> <span class="token punctuation">{</span>
  <span class="token property">width</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
  <span class="token property">height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
  <span class="token property">border-radius</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div></div></div> <h2 id="插值"><a href="#插值" aria-hidden="true" class="header-anchor">#</a> 插值</h2> <p>属性的名称可以包括<a href="/sass-cn/api/Interpolation.html">插值</a>，这使得根据需要动态生成属性成为可能。您甚至可以插入整个属性名!</p> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token keyword">@mixin</span> <span class="token function">prefix</span><span class="token punctuation">(</span><span class="token variable">$property</span><span class="token punctuation">,</span> <span class="token variable">$value</span><span class="token punctuation">,</span> <span class="token variable">$prefixes</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">@each</span> <span class="token selector"><span class="token variable">$prefix</span> in <span class="token variable">$prefixes</span> </span><span class="token punctuation">{</span>
    <span class="token property">-<span class="token variable">#{$prefix}</span>-<span class="token variable">#{$property}</span></span><span class="token punctuation">:</span> <span class="token variable">$value</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token property"><span class="token variable">#{$property}</span></span><span class="token punctuation">:</span> <span class="token variable">$value</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token selector">.gray </span><span class="token punctuation">{</span>
  <span class="token keyword">@include</span> <span class="token function">prefix</span><span class="token punctuation">(</span>filter<span class="token punctuation">,</span> <span class="token function">grayscale</span><span class="token punctuation">(</span>50%<span class="token punctuation">)</span><span class="token punctuation">,</span> moz webkit<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token atrule-line"><span class="token atrule">@mixin</span> prefix($property, $value, $prefixes)</span>
<span class="token atrule-line">  <span class="token atrule">@each</span> $prefix in $prefixes</span>
<span class="token property-line">    <span class="token property">-#{$prefix}-#{$property}</span><span class="token punctuation">:</span> <span class="token variable">$value</span></span>

<span class="token property-line">  <span class="token property">#{$property}</span><span class="token punctuation">:</span> <span class="token variable">$value</span></span>


<span class="token selector">.gray</span>
<span class="token atrule-line">  <span class="token atrule">@include</span> prefix(filter, grayscale(50%), moz webkit)</span>

</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">.gray</span> <span class="token punctuation">{</span>
  <span class="token property">-moz-filter</span><span class="token punctuation">:</span> <span class="token function">grayscale</span><span class="token punctuation">(</span>50%<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token property">-webkit-filter</span><span class="token punctuation">:</span> <span class="token function">grayscale</span><span class="token punctuation">(</span>50%<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token property">filter</span><span class="token punctuation">:</span> <span class="token function">grayscale</span><span class="token punctuation">(</span>50%<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

</code></pre></div></div></div></div> <h2 id="嵌套"><a href="#嵌套" aria-hidden="true" class="header-anchor">#</a> 嵌套</h2> <p>许多CSS属性都以充当某种名称空间的相同前缀开始。例如，<code>font-family</code>、<code>font-size</code>和<code>font-weight</code>都以<code>font-</code>开头。通过嵌套属性声明，Sass使这一过程更加简单，并且减少了冗余。外部属性名被添加到内部属性名，中间用连字符分隔。</p> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token selector">.enlarge </span><span class="token punctuation">{</span>
  <span class="token property">font-size</span><span class="token punctuation">:</span> 14px<span class="token punctuation">;</span>
  <span class="token selector">transition: </span><span class="token punctuation">{</span>
    <span class="token property">property</span><span class="token punctuation">:</span> font-size<span class="token punctuation">;</span>
    <span class="token property">duration</span><span class="token punctuation">:</span> 4s<span class="token punctuation">;</span>
    <span class="token property">delay</span><span class="token punctuation">:</span> 2s<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token selector"><span class="token parent important">&amp;</span>:hover </span><span class="token punctuation">{</span> <span class="token property">font-size</span><span class="token punctuation">:</span> 36px<span class="token punctuation">;</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token selector">.enlarge</span>
<span class="token property-line">  <span class="token property">font-size</span><span class="token punctuation">:</span> 14px</span>
<span class="token property-line">  <span class="token property">transition</span><span class="token punctuation">:</span></span>
<span class="token property-line">    <span class="token property">property</span><span class="token punctuation">:</span> font-size</span>
<span class="token property-line">    <span class="token property">duration</span><span class="token punctuation">:</span> 4s</span>
<span class="token property-line">    <span class="token property">delay</span><span class="token punctuation">:</span> 2s</span>

<span class="token property-line">  <span class="token property">&amp;</span><span class="token punctuation">:</span><span class="token property">hover</span></span>
<span class="token property-line">    <span class="token property">font-size</span><span class="token punctuation">:</span> 36px</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">.enlarge</span> <span class="token punctuation">{</span>
  <span class="token property">font-size</span><span class="token punctuation">:</span> 14px<span class="token punctuation">;</span>
  <span class="token property">transition-property</span><span class="token punctuation">:</span> font-size<span class="token punctuation">;</span>
  <span class="token property">transition-duration</span><span class="token punctuation">:</span> 4s<span class="token punctuation">;</span>
  <span class="token property">transition-delay</span><span class="token punctuation">:</span> 2s<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">.enlarge:hover</span> <span class="token punctuation">{</span>
  <span class="token property">font-size</span><span class="token punctuation">:</span> 36px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div></div></div> <p>一些CSS属性名可作为命名空间，然后嵌套着使用。</p> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token selector">.info-page </span><span class="token punctuation">{</span>
  <span class="token selector">margin: auto </span><span class="token punctuation">{</span>
    <span class="token property">bottom</span><span class="token punctuation">:</span> 10px<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span> 2px<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token selector">.info-page</span>
<span class="token property-line">  <span class="token property">margin</span><span class="token punctuation">:</span> auto</span>
<span class="token property-line">    <span class="token property">bottom</span><span class="token punctuation">:</span> 10px</span>
<span class="token property-line">    <span class="token property">top</span><span class="token punctuation">:</span> 2px</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">.info-page</span> <span class="token punctuation">{</span>
  <span class="token property">margin</span><span class="token punctuation">:</span> auto<span class="token punctuation">;</span>
  <span class="token property">margin-bottom</span><span class="token punctuation">:</span> 10px<span class="token punctuation">;</span>
  <span class="token property">margin-top</span><span class="token punctuation">:</span> 2px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

</code></pre></div></div></div></div> <h2 id="隐式声明"><a href="#隐式声明" aria-hidden="true" class="header-anchor">#</a> 隐式声明</h2> <p>有时，您只希望在某些时候显示属性声明。如果一个声明的值为<code>null</code>或一个空的<a href="/sass-cn/api/Values/Strings.html">不带引号的字符串</a>，Sass根本不会将该声明编译成CSS。</p> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token property"><span class="token variable">$rounded-corners</span></span><span class="token punctuation">:</span> <span class="token boolean">false</span><span class="token punctuation">;</span>

<span class="token selector">.button </span><span class="token punctuation">{</span>
  <span class="token property">border</span><span class="token punctuation">:</span> 1px solid black<span class="token punctuation">;</span>
  <span class="token property">border-radius</span><span class="token punctuation">:</span> <span class="token function">if</span><span class="token punctuation">(</span><span class="token variable">$rounded-corners</span><span class="token punctuation">,</span> 5px<span class="token punctuation">,</span> <span class="token null keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token variable-line"><span class="token variable">$rounded-corners</span><span class="token punctuation">:</span> false</span>

<span class="token selector">.button</span>
<span class="token property-line">  <span class="token property">border</span><span class="token punctuation">:</span> 1px solid black</span>
<span class="token property-line">  <span class="token property">border-radius</span><span class="token punctuation">:</span> if(<span class="token variable">$rounded-corners</span>, 5px, null)</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">.button</span> <span class="token punctuation">{</span>
  <span class="token property">border</span><span class="token punctuation">:</span> 1px solid black<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div></div></div> <h2 id="自定义属性"><a href="#自定义属性" aria-hidden="true" class="header-anchor">#</a> 自定义属性</h2> <blockquote><p>此段翻译有误，待更正
兼容性（SassScript 语法）：Dart Sass ✓<span class="sa-ver-divider">|</span>LibSass <span class="badge tip" style="vertical-align:middle;" data-v-0f036736>3.5.0+</span> <span class="sa-ver-divider">|</span>Ruby Sass  <span class="badge tip" style="vertical-align:middle;" data-v-0f036736>3.5.0+</span>
旧版本的LibSass和Ruby Sass与任何其他属性声明一样解析自定义属性声明，允许将所有SassScript表达式作为值。即使在使用这些版本时，也建议使用插值函数注入SassScript值以实现向前兼容性。<br> <br>
有关详细信息，请参阅<a href="/sass-cn/api/BreakChanges/">重大改变</a>页面。</p></blockquote> <p><a href="https://developer.mozilla.org/zh-CN/docs/Web/CSS/--*" target="_blank" rel="noopener noreferrer">CSS自定义属性<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a>，也称为CSS变量，有一个不寻常的声明语法：它们几乎允许在声明值中包含任何文本。而且，JavaScript可以访问这些值，因此任何值都可能与用户相关。这包括通常被解析为SassScript的值。</p> <p>因此，Sass对自定义属性声明的解析与其他属性声明不同。所有标记，包括那些看起来像SassScript的标记，都按原样传递给CSS。唯一的例外是<a href="/sass-cn/api/Interpolation.html">插值</a>，这是将动态值注入自定义属性的唯一方法。</p> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token property"><span class="token variable">$primary</span></span><span class="token punctuation">:</span> #81899b<span class="token punctuation">;</span>
<span class="token property"><span class="token variable">$accent</span></span><span class="token punctuation">:</span> #302e24<span class="token punctuation">;</span>
<span class="token property"><span class="token variable">$warn</span></span><span class="token punctuation">:</span> #dfa612<span class="token punctuation">;</span>

<span class="token selector">:root </span><span class="token punctuation">{</span>
  <span class="token property">--primary</span><span class="token punctuation">:</span> <span class="token variable">#{$primary}</span><span class="token punctuation">;</span>
  <span class="token property">--accent</span><span class="token punctuation">:</span> <span class="token variable">#{$accent}</span><span class="token punctuation">;</span>
  <span class="token property">--warn</span><span class="token punctuation">:</span> <span class="token variable">#{$warn}</span><span class="token punctuation">;</span>

  <span class="token comment">// Even though this looks like a Sass variable, it's valid CSS so it's not</span>
  <span class="token comment">// evaluated.</span>
  <span class="token property">--consumed-by-js</span><span class="token punctuation">:</span> <span class="token variable">$primary</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token variable-line"><span class="token variable">$primary</span><span class="token punctuation">:</span> #81899b</span>
<span class="token variable-line"><span class="token variable">$accent</span><span class="token punctuation">:</span> #302e24</span>
<span class="token variable-line"><span class="token variable">$warn</span><span class="token punctuation">:</span> #dfa612</span>

<span class="token property-line"><span class="token punctuation">:</span><span class="token property">root</span></span>
<span class="token property-line">  <span class="token property">--primary</span><span class="token punctuation">:</span> <span class="token variable">#{$primary}</span></span>
<span class="token property-line">  <span class="token property">--accent</span><span class="token punctuation">:</span> <span class="token variable">#{$accent}</span></span>
<span class="token property-line">  <span class="token property">--warn</span><span class="token punctuation">:</span> <span class="token variable">#{$warn}</span></span>

  <span class="token comment">// Even though this looks like a Sass variable, it's valid CSS so it's not</span>
  <span class="token comment">// evaluated.</span>
<span class="token property-line">  <span class="token property">--consumed-by-js</span><span class="token punctuation">:</span> <span class="token variable">$primary</span></span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">:root</span> <span class="token punctuation">{</span>
  <span class="token property">--primary</span><span class="token punctuation">:</span> #81899b<span class="token punctuation">;</span>
  <span class="token property">--accent</span><span class="token punctuation">:</span> #302e24<span class="token punctuation">;</span>
  <span class="token property">--warn</span><span class="token punctuation">:</span> #dfa612<span class="token punctuation">;</span>
  <span class="token property">--consumed-by-js</span><span class="token punctuation">:</span> $primary<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div></div></div> <div class="warning custom-block"><p>不幸的是，<a href="/sass-cn/api/Interpolation.html">插值</a>从字符串中删除了引号，这使得当引号字符串来自Sass变量时，很难将它们用作自定义属性的值。作为一种解决方案，您可以使用<a href="%E5%BE%85%E7%A1%AE%E5%AE%9A">inspect</a>来保存引号。</p></div> <div class="el-tabs el-tabs--top el-tabs--border-card"><div class="el-tabs__header is-top"><div class="el-tabs__nav-wrap is-top"><div class="el-tabs__nav-scroll"><div role="tablist" class="el-tabs__nav is-top" style="transform:translateX(-0px);"></div></div></div></div><div class="el-tabs__content"><div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-scss extra-class"><pre class="language-scss"><code><span class="token property"><span class="token variable">$font-family-sans-serif</span></span><span class="token punctuation">:</span> -apple-system<span class="token punctuation">,</span> BlinkMacSystemFont<span class="token punctuation">,</span> <span class="token string">&quot;Segoe UI&quot;</span><span class="token punctuation">,</span> Roboto<span class="token punctuation">;</span>
<span class="token property"><span class="token variable">$font-family-monospace</span></span><span class="token punctuation">:</span> SFMono-Regular<span class="token punctuation">,</span> Menlo<span class="token punctuation">,</span> Monaco<span class="token punctuation">,</span> Consolas<span class="token punctuation">;</span>

<span class="token selector">:root </span><span class="token punctuation">{</span>
  <span class="token property">--font-family-sans-serif</span><span class="token punctuation">:</span> #<span class="token punctuation">{</span><span class="token function">inspect</span><span class="token punctuation">(</span><span class="token variable">$font-family-sans-serif</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
  <span class="token property">--font-family-monospace</span><span class="token punctuation">:</span> #<span class="token punctuation">{</span><span class="token function">inspect</span><span class="token punctuation">(</span><span class="token variable">$font-family-monospace</span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-sass extra-class"><pre class="language-sass"><code><span class="token variable-line"><span class="token variable">$font-family-sans-serif</span><span class="token punctuation">:</span> -apple-system, BlinkMacSystemFont, </span><span class="token string">&quot;Segoe UI&quot;</span><span class="token selector">, Roboto</span>
<span class="token variable-line"><span class="token variable">$font-family-monospace</span><span class="token punctuation">:</span> SFMono-Regular, Menlo, Monaco, Consolas</span>

<span class="token property-line"><span class="token punctuation">:</span><span class="token property">root</span></span>
<span class="token property-line">  <span class="token property">--font-family-sans-serif</span><span class="token punctuation">:</span> #{inspect(<span class="token variable">$font-family-sans-serif</span>)}</span>
<span class="token property-line">  <span class="token property">--font-family-monospace</span><span class="token punctuation">:</span> #{inspect(<span class="token variable">$font-family-monospace</span>)}</span>
</code></pre></div></div> <div role="tabpanel" aria-hidden="true" id="pane-null" aria-labelledby="tab-null" class="el-tab-pane" style="display:none;"><div class="language-css extra-class"><pre class="language-css"><code><span class="token selector">:root</span> <span class="token punctuation">{</span>
  <span class="token property">--font-family-sans-serif</span><span class="token punctuation">:</span> -apple-system<span class="token punctuation">,</span> BlinkMacSystemFont<span class="token punctuation">,</span> <span class="token string">&quot;Segoe UI&quot;</span><span class="token punctuation">,</span> Roboto<span class="token punctuation">;</span>
  <span class="token property">--font-family-monospace</span><span class="token punctuation">:</span> SFMono-Regular<span class="token punctuation">,</span> Menlo<span class="token punctuation">,</span> Monaco<span class="token punctuation">,</span> Consolas<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div></div></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">11/5/2019, 4:49:11 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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